YS/T 535.9-2009Chemical analysis methods of sodium fluoride. Part 9: Determination of chloride content. The turbidimetric method (English PDF)

Foreword

YS/T 535 "chemical analysis of sodium fluoride" is divided into 10 parts.

--- Part 1. Determination of the weight of water in the wet method;

--- Part 2. Determination of distillation of fluorine content - thorium nitrate titration volumetric method;

--- Part 3. Determination of silicon content - Molybdenum blue spectrophotometric method;

--- Part 4. Determination of iron content phenanthroline spectrophotometry;

--- Part 5. Determination of soluble sulfate turbidity method;

--- Part 6. Determination of carbonate content - Gravimetric method;

--- Part 7. Determination of acidity and law;

--- Part 8. Water-insoluble content - Gravimetric method;

--- Part 9. Determination of chlorine turbidity method;

--- Part 10. Preparation and storage of test samples.

Part is divided into 9 parts.

The partial replacement of YS/T 535.9-2006 (formerly GB/T 8158.9-1987).

This part is the "determination of the amount of chlorine fluoride chemical analysis of turbidity Law" YS/T 535.9-2006 revision, and YS/T 535.9-Compared to 2006, an increase of equal precision and quality assurance and control content.

The non-ferrous metal part by the National Standardization Technical Committee and centralized.

This part of the Fushun Aluminum Co., Ltd., China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting.

This part of the Fushun Aluminum Co. drafted.

1 Scope

This section specifies the determination method of chlorine in sodium fluoride.

This section applies to the determination of sodium chloride content. Measurement range (mass fraction). >=0.005%.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

YS/T 535.10-2009 Methods for chemical analysis of sodium fluoride - Part 10. Sample preparation and storage

3 Method summary

In the presence of boric acid, turbidity by precipitation of silver chloride produced was measured.

4 Reagents

4.1 nitric acid (rho = 1.40g/mL).

4.2 boric acid solution (40g/L).

4.3 silver nitrate solution (0.1mol/L).

5 Instruments

Spectrophotometer.

6 Sample

The specimen shall conform YS/T 535.10-2009 4.2 requirements.

7 Procedure